Other Chemistry Answers

A new drug is being developed by an important pharmaceutical company. It has been noted that the interaction in solution between the newly developed drug and a common excipient leads to formation of potentially toxic degradants of the drug. It was determined that the degradation of the newly developed drug follows first order kinetics with the time taken to decrease the concentration to 45% of the initial (4.5 mM) being 2 days.

a) Calculate the rate constant for the first order degradation reaction. Use appropriate units. (30%)

b) Determine the half-life for this degradation reaction. (20%)

c) Calculate the rate constant if the reaction had followed zero order kinetics. Use appropriate units. (25%)

d) Calculate the rate constant if the reaction had followed second order kinetics. Use appropriate units. (25%)

To determine the concentration of fentanyl in the blood sample, you first need to prepare a stock solution of fentanyl in an appropriate solvent by weighing 2.74 mg of fentanyl and dissolving into the appropriate volume. Determine the volume of solvent needed to dissolve the 2.74 mg to achieve a stock solution concentration of 8.14 x 10-5 M.

The stock solution prepared in section b was further used to prepare five solutions (10 mL total volume) of different concentrations by serial dilutions by pipetting aliquots of 2 mL. Calculate the concentration of each of the newly prepared five solutions in molarity (M) units.

Lastly, the blood sample suspected of containing fentanyl was analysed. The concentration of fentanyl in the blood sample was determined to be 1.78 x 10-6 M. Calculate the number of micrograms (μm) of fentanyl present in the blood sample if the volume of the sample was 10 mL.

How many turns of the citcric acid cycle are implicated in accounting for the net oxidation of each of the following compounds to carbon dioxide and water?

a) Glucose:
b) Glyceraldehyde:
c) citric acid:
d) succinic acid:

Determine the new volume of a gas at that occpies an original volume of 55 L at 750mmHg and 25 degrees celsius if the pressure is changed to 1.03 atm and the temperature to 30 degrees celsius.

Zinc metal reacts with hydrochloric acid to produce hydrogen gas and zinc chloride. Given a 0.215 g piece of zinc reacting with 57ml of 0.10m hydrochloric acid, determine the maximum volume of hydrogen gas that can be formed at 20 degrees Celsius and 760mmhg. (This is a limiting reactant problem)

A sample of 2,4-hexadiene in methanol in a 2.5cm cell shows an absorbance of 0.65 at 240.0nm. What is the concentration of the diene?The molar absorption at this wavelength is 12100 dm3 mol-1 cm-1

Hydrofluoric acid in produced by a reaction between hydrogen and fluorine gases. Given 23 g of hydrogen to start, what volume of hydrofluoric acid Will ve produced at standard pressure and temperature of 28 degrees Celsius. Assume excess fluorine gas.

Given a 550 L sample of neon gas that has a temperature of 23 degrees c and a pressure of 765 mmh, determine how many moles are present. how many grams is this?

how many grams of beryllium chloride would you need to add to 125 mL of water to make a 0.050 molal solution

The three pH values tested correspond to digestive processes that occur in the stomach (pH1)the first part of the intestines duodenum (pH6) further into intestines (pH8). At which pH value did you find the highest enzymatic activity ? Where in the body does lactose act to digest lactose?